International Journal of Agronomy / 2020 / Article / Tab 1

Research Article

Glyphosate-Resistant Canada Fleabane Control in Winter Wheat with Postemergence Herbicides

Table 1

Glyphosate-resistant Canada fleabane (GRCF) control 2, 4, and 8 weeks after herbicide application (WAA), GRCF density, and dry biomass 4 WAA and winter wheat yield for herbicides applied postemergence from 6 sites in southwestern Ontario in 2018–2019.

Herbicide treatmentRate (g ai ha−1)GRCF Control (%)GRCF density (plants m−2)GRCF dry biomass (g m−2)Winter wheat yield (T ha−1)
2 WAA4 WAA8 WAA

Weed-free control1001001000 a0 a4.13 ab

Weedy control0 f0 e0 e142.1 h10.8 e3.58 b

Pyrasulfotole/bromoxynil + AMSa (1 L ha−1)20589 ab97 ab98 ab0.7 abc0.25 abc4.31 ab

2,4-D ester85076 abc93 ab94 ab6.4 bcde0.37 abc4.09 ab

Thifensulfuron-ethyl/tribenuron-methyl + fluroxypyr + MCPA ester + NISb (0.2% v/v)15 + 70 + 28062 bcd74 bc71 bc17.1 def1.46 bc3.96 ab

Halauxifen-methyl + MSOc (1% v/v)576 abc98 ab99 ab0.8 abc0.08 ab4.36 ab

Fluroxypyr/halauxifen-methyl + MCPA EHE82 + 37278 abc97 ab98 ab1.9 abcd0.20 abc4.19 ab

Pyroxsulam + NIS (0.25% v/v) + UANd (2 L ha−1)1519 e8 d7 d49.9 fg8.58 de3.96 ab

Pyrasulfotole/bromoxynil/fluroxypyr27791 ab98 ab98 ab2.3 abcd0.20 abc4.16 ab

Pyrasulfotole/bromoxynil/thiencarbazone-methyl +  AMS (1 L ha-1)21194 a100 a100 a0.1 ab0.02 ab4.56 a

Pyrasulfotole/bromoxynil/thiencarbazone-methyl +  MCPA ester + AMS (1 L ha−1)211 + 28095 a100 a100 a0.8 abc0.02 ab4.15 ab

Tribenuron-methyl + thiencarbazone-methyl +  AMS (1 L ha-1)7.5 + 511 ef5 de4 de55.1 gh7.17 de4.02 ab

Tribenuron-methyl + thiencarbazone-methyl +  MCPA ester + AMS (1 L ha−1)7.5 + 5 + 28038 de38 cd33 cd28.4 efg3.12 cd3.93 ab

Fluroxypyr/bromoxynil/MCPA60067 abcd81 abc84 ab13.7 cdef0.94 bc3.67 ab

Tolpyralate + MSO (0.5% v/v) + UAN (2.5% v/v)4057 cd73 bc78 ab6.9 bcdef0.52 abc4.22 ab

Fluroxypyr/halauxifen-methyl + pyroxsulam +MCPA EHE + NIS (0.25% v/v)82 + 15 + 37279 ab96 ab96 ab1.8 abcd0.23 abc3.92 ab

Means within a column followed by the same lowercase letter do not differ significantly according to Tukey’s HSD at Ammonium sulfate. bNonionic surfactant. cMethylated seed oil. d28% urea ammonium nitrate.

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